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Re: What causes black streaks on screen?

Check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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that is usually caused by cleaning the screen with windex the windex runs down the screen bewteen the screen and plastic frame and actually seeps inside between the screen layers. Eventually it may go away by itself if the circles are not too bad but in most cases the damage is permanent.It can also be an issue called screen delamination which there is no fix for.

hi,
usually you can correct this issue with only a few system checks, dark streaks can be caused by damaged pixels on the screen, in which case you need to replace the TV.

Inspect where the dark streaks are on the television. If the streaks occur at the same place on the top and bottom of the screen, they are due to the formatting of a movie or television show you are watching. This is normal. Also, if the streaks appear on the left and right of the screen, they are due to the show being filmed in full-screen instead of wide-screen. This also is normal.

Change the input setting so you are viewing the contents of a different device. If the dark streaks are gone, you know they are due to the device connected to it. However, if the dark streaks remains no matter what input the TV is connected to, the problem lies with the television.

Inspect the cable connection. Oftentimes when connecting a computer to an LCD TV, you can have strange dark streaks across the screen. Use a DVI-to-HDMI cable connection when plugging in your computer, then press the "Menu" button on your TV remote, select "Picture" and chose "Square Pixel." See whether the image adjusts and the dark streak goes away.

Contact the manufacturer of your LCD television if the dark streak remains. This streak can be caused by a defect in the television; if the TV is still under warranty, you can have it replaced.

Plug an external monitor into the VGA-output port.
If the black-streak shows up on the external monitor, it's your computer, and maybe the video-adapter, that is the problem.
If there's no black-streak, then it's your LCD-screen that is damaged.
It will cost about $200 for a replacement screen, and about $60 for an hour of a technician's time to open-up your laptop, remove the old screen, install the new screen, close-up your laptop, and to test it.

Or, if your computer is still under warranty, it may be possible to get the repair ($260) done via the warranty.

Sounds like there are multiple problems on this machine. Dirty optics can cause light images, white streaks can be caused by dirty cortron wires(becareful when cleaning the wire or all the wires 3 usually, Q-tip can help) , not enough toner in the ink hopper, dirty cleaning blade in the drum modual. A bad heat roll can cause streaks also. Background with light images and black spots can be caused by competitive toner not working very good.

If you're experiencing horizontal streaks, and already tried changing cartridges but that don't help, look in the bottom of the paper tray. If that small metal ground terminal gets ditry or bent, that could be the cause.